Multiplying Rational Numbers
(-4) * 5 =
-20
7.824 + 23.5=
31.324
38.134 – 31.9=
6.234
60 / 5
12
Only when subtracting rational numbers do we use
__ __ __, which stands for _______,_______,______.
When subtracting rational numbers we use KFC stands for keep, flip, change.
9 * -7 =
-63
-10.5 + 4.6
What is -5.9?
2.63 - (-12.9)
What is 15.53?
-34.6/2
-17.3
When multiplying or dividing a positive by a negative we get a _______ signed number.
When multiplying or dividing a negative by a positive we get a ________ signed number.
negative
negative
When multiplying different signs together, the answer will be a negative signed number.
-5 * -5 =
25
-14 + -8
-22
- 20 - (-4) =
-16
-14/2
-7
When multiplying or dividing a positive by a positive we get a ______ signed number.
When multiplying or dividing a negative by a negative we get a _______ signed number.
positive
positive
When multiplying the same signs together, the answer will be a positive signed number
-79.3 * 3 =
-237.9
–33 + 91
58
–3.37 – 9.668
-13.038
542.7/-9
-60.9
When adding two numbers of different signs we _______ the number with the smaller _____________ from the number with the bigger _____________.
We subtract the number with the smaller value from the number with the bigger value.
-634 * -5.4 =
3423.6
–16 + –25
-31
4 1/4 - 12.36
What is -8.11?
-5/6 divide 1/3
-15/6 or -2 3/6 or -2 1/2
When dividing fractions we _____ the second fraction so that the _denominator_____ is on top and the _numerator_____ is on the bottom.
We call the second fraction a _________.
Then we multiply straight across.
Flip the second fraction so that the denominator is on top and the number is on the bottom.
The second fraction is called a reciprocal.
Then we multiply straight across.